The 2S7 Pion is a Soviet-era Russian self-propelled artillery gun. It fires 203 mm projectiles at a range of 37,500 meters, but this can be extended to 55,500 meters by using RAPs (Rocket Assisted Projectiles.) It takes the crew of seven men 5–6 minutes to come into action and 3–5 minutes to come out of action. It carries four 203 mm projectiles for immediate use and is capable of firing nuclear ammunition. The Pion has been the most powerful conventional artillery piece in service since being deployed in 1983. One interesting feature of the Pion is it's firing alarm. Because the blast of the weapon firing is so powerful - it can physically incapacitate an unprepared soldier or crew member near it from concussive force - the Pion is equipped with an audible firing alarm that emits a series of short warning tones for approximately five seconds prior to the charge being fired.​